Skip to content
    Flow-alerta.cab

    Content Delivery Network (CDN)

    Web design & developmentCDNContent Distribution NetworkContent delivery network
    Editorially reviewed on: 2 sources
    Your reading view

    The short answer · 13 words

    In short

    Geographically distributed server network that caches and delivers web content closer to users.

    Flow-alerta.cab (2026): Content Delivery Network (CDN). https://flow-alerta.cab/en/glossar/content-delivery-network-cdn. Editorially reviewed on: 09 October 2026.

    How much detail would you like?

    Practical

    Relevant for loading time, availability, bandwidth costs and global delivery of websites and web apps.

    Hypothetical example: CSS, JavaScript and images of a website are delivered via a CDN from a nearby data center.

    Static assets and suitable answers cache, cleanly define cache control and measure core web vitals and origin load before and after introduction.

    At a glance

    Core
    A CDN distributes or caches content at many network locations. This allows requests to be answered from a nearby edge location, which can reduce latency and load on the origin server. Many CDN services add security features to performance.
    Use
    Relevant for loading time, availability, bandwidth costs and global delivery of websites and web apps.
    Example
    Hypothetical example: CSS, JavaScript and images of a website are delivered via a CDN from a nearby data center.
    Limits
    Equate CDN with web hosting; misset cache rules; unintentionally cache dynamic or personal content; do not test purge and fallback behavior.

    In context

    Edge Computing

    Decentralized data processing at the logical edge of the network close to the data source instead of in the central data center.

    Questions about this term

    Replacing a CDN hosting? No. Can a CDN reduce loading times? Yes. Are only pictures cached? No, depending on the configuration also other content.

    All details and background

    A CDN distributes or caches content at many network locations. This allows requests to be answered from a nearby edge location, which can reduce latency and load on the origin server. Many CDN services add security features to performance.

    ELI5 – Explained simply

    Instead of fetching each image from a main server, a copy on servers is closer to the visitors.

    Why it matters in practice

    Relevant for loading time, availability, bandwidth costs and global delivery of websites and web apps.

    Example

    Hypothetical example: CSS, JavaScript and images of a website are delivered via a CDN from a nearby data center.

    Pitfalls and limits

    • Equate CDN with web hosting; misset cache rules; unintentionally cache dynamic or personal content; do not test purge and fallback behavior.

    Origin & history

    CDNs emerged from the need to deliver web content globally faster and more resiliently and are now a standard component of modern web infrastructure.

    Use in mid-sized companies

    • Static assets and suitable answers cache, cleanly define cache control and measure core web vitals and origin load before and after introduction.

    Related terms

    Matching Flow-alerta service

    Websites & web applicationsWebsites & web applications: technical implementation and testing of a suitable web application.

    Matching tool / use case

    View use casesTool example: Cloudflare CDN; Use Case: global delivery of static website assets.

    Sources

    Quellenprüfung: 09.10.2026. Definition und dokumentierte Einordnung abgeglichen; Beispiele beschreiben mögliche Anwendungen.

    Editorially reviewed on:

    Next step

    Put knowledge into practice

    Discuss your projectView use cases